Details

Rationale:
To my mind it is more consistent - at the moment, you are in the WPS, you press the menu key, then the ACTION_TREE_STOP key, and your music stops. You are in the radio, you press the same, and nothing happens.

Implementation:
Obviously, this is trivial in extremis, but I'm no coder... I've included radio.h, and added a call to radio_stop() in list_stop_handler(), in misc.c. Both changes are behind ifdef CONFIG_TUNERs. This is guesswork, and might be horribly wrong, but it seems to work on a Sansa Clip+. I tried turning off CONFIG_TUNER to test it, but that results in all kinds of oddness, and I don't think it's because of this patch.